New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
- Autores
- Torres, Andrea Fabiana; Arias, María Laura; Kraus, Michaela; Mercanti, Lorena Verónica; Eenmäe, Tõnis
- Año de publicación
- 2023
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 m and 2.3 m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Ha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios.
Instituto de Astrofísica de La Plata - Materia
-
Ciencias Astronómicas
stars: emission-line, Be
stars: peculiar
stars: individual: MWC 645
circumstellar matter
binaries: general
techniques: spectroscopic - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/159964
Ver los metadatos del registro completo
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New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopyTorres, Andrea FabianaArias, María LauraKraus, MichaelaMercanti, Lorena VerónicaEenmäe, TõnisCiencias Astronómicasstars: emission-line, Bestars: peculiarstars: individual: MWC 645circumstellar matterbinaries: generaltechniques: spectroscopicThe B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 m and 2.3 m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Ha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios.Instituto de Astrofísica de La Plata2023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/159964enginfo:eu-repo/semantics/altIdentifier/issn/2075-4434info:eu-repo/semantics/altIdentifier/doi/10.3390/galaxies11030072info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:41:51Zoai:sedici.unlp.edu.ar:10915/159964Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:41:51.701SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy |
title |
New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy |
spellingShingle |
New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy Torres, Andrea Fabiana Ciencias Astronómicas stars: emission-line, Be stars: peculiar stars: individual: MWC 645 circumstellar matter binaries: general techniques: spectroscopic |
title_short |
New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy |
title_full |
New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy |
title_fullStr |
New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy |
title_full_unstemmed |
New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy |
title_sort |
New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy |
dc.creator.none.fl_str_mv |
Torres, Andrea Fabiana Arias, María Laura Kraus, Michaela Mercanti, Lorena Verónica Eenmäe, Tõnis |
author |
Torres, Andrea Fabiana |
author_facet |
Torres, Andrea Fabiana Arias, María Laura Kraus, Michaela Mercanti, Lorena Verónica Eenmäe, Tõnis |
author_role |
author |
author2 |
Arias, María Laura Kraus, Michaela Mercanti, Lorena Verónica Eenmäe, Tõnis |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
Ciencias Astronómicas stars: emission-line, Be stars: peculiar stars: individual: MWC 645 circumstellar matter binaries: general techniques: spectroscopic |
topic |
Ciencias Astronómicas stars: emission-line, Be stars: peculiar stars: individual: MWC 645 circumstellar matter binaries: general techniques: spectroscopic |
dc.description.none.fl_txt_mv |
The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 m and 2.3 m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Ha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios. Instituto de Astrofísica de La Plata |
description |
The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 m and 2.3 m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Ha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/159964 |
url |
http://sedici.unlp.edu.ar/handle/10915/159964 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/issn/2075-4434 info:eu-repo/semantics/altIdentifier/doi/10.3390/galaxies11030072 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
eu_rights_str_mv |
openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
dc.format.none.fl_str_mv |
application/pdf |
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